Related Experiment Video
Updated: Mar 15, 2026
07:54
Use of a Hanging-weight System for Isolated Renal Artery Occlusion
Published on: July 19, 2011
16.6K
Current Analysis of Hangings That Deviates From Recently Published Studies
Leigh Hlavaty1, William Kasper, LokMan Sung
1From the Department of Pathology, University of Michigan, Ann Arbor, MI; and Wayne County Medical Examiner's Office, Detroit, MI.
The American Journal of Forensic Medicine and Pathology
|August 30, 2016
Summary
This study on suicidal hangings found fewer internal injuries than recent literature suggests. Pathologists consistently identified external signs like ligature marks and petechiae, but internal findings were notably absent.
Area of Science:
- Forensic Pathology
- Autopsy Studies
Background:
- The constellation of injuries in hangings is frequently reviewed in forensic pathology.
- Recent studies report high concordance between hangings and internal findings (e.g., strap muscle hemorrhages, hyoid/thyroid fractures).
Purpose of the Study:
- To examine autopsied suicidal hangings over a 9-year period.
- To correlate external and internal autopsy observations with various factors.
- To address concerns of confirmation bias in injury assessment.
Main Methods:
- A 2-part study (retrospective and prospective) at the Wayne County Medical Examiner's Office.
- Correlation of autopsy observations with age, sex, body height, BMI, ligature, and suspension height.
- Consistent injury identification and documentation by pathologists.
Main Results:
- Nearly all cases displayed ligature marks, consistent with established forensic texts.
- Strong association found between body position and petechiae.
- A distinctive paucity of internal injuries was observed, diverging from contemporary articles.
Conclusions:
- Findings suggest a lower incidence of internal injuries in suicidal hangings than recently reported.
- Pathologist consistency in injury assessment was confirmed, mitigating concerns of confirmation bias.
Related Concept Videos
01:52Regression Toward the Mean
7.3K
Regression toward the mean (“RTM”) is a phenomenon in which extremely high or low values—for example, and individual’s blood pressure at a particular moment—appear closer to a group’s average upon remeasuring. Although this statistical peculiarity is the result of random error and chance, it has been problematic across various medical, scientific, financial and psychological applications. In particular, RTM, if not taken into account, can interfere when...
7.3K
01:19Testing a Claim about Standard Deviation
3.1K
A complete procedure to test a claim about population standard deviation or population variance is explained here.
The hypothesis testing for the claim of population standard deviation (or variance) requires the data and samples to be random and unbiased. The population distribution also must be normal. There is no specific requirement on the sample size as the estimation is based on the chi-square distribution.
As a first step, the hypothesis (null and alternative) concerning the claim about...
The hypothesis testing for the claim of population standard deviation (or variance) requires the data and samples to be random and unbiased. The population distribution also must be normal. There is no specific requirement on the sample size as the estimation is based on the chi-square distribution.
As a first step, the hypothesis (null and alternative) concerning the claim about...
3.1K
01:21Friedman Two-way Analysis of Variance by Ranks
538
Friedman's Two-Way Analysis of Variance by Ranks is a nonparametric test designed to identify differences across multiple test attempts when traditional assumptions of normality and equal variances do not apply. Unlike conventional ANOVA, which requires normally distributed data with equal variances, Friedman's test is ideal for ordinal or non-normally distributed data, making it particularly useful for analyzing dependent samples, such as matched subjects over time or repeated measures...
538
01:14Decision Making: Traditional Method
5.7K
The process of hypothesis testing based on the traditional method includes calculating the critical value, testing the value of the test statistic using the sample data, and interpreting these values.
First, a specific claim about the population parameter is decided based on the research question and is stated in a simple form. Further, an opposing statement to this claim is also stated. These statements can act as null and alternative hypotheses, out of which a null hypothesis would be a...
First, a specific claim about the population parameter is decided based on the research question and is stated in a simple form. Further, an opposing statement to this claim is also stated. These statements can act as null and alternative hypotheses, out of which a null hypothesis would be a...
5.7K
01:00Detection of Gross Error: The Q Test
7.2K
When one or more data points appear far from the rest of the data, there is a need to determine whether they are outliers and whether they should be eliminated from the data set to ensure an accurate representation of the measured value. In many cases, outliers arise from gross errors (or human errors) and do not accurately reflect the underlying phenomenon. In some cases, however, these apparent outliers reflect true phenomenological differences. In these cases, we can use statistical methods...
7.2K
02:45Self-Discrepancy Theory
19.0K
One influential perspective on what motivates people's behavior is detailed in Tory Higgin's self-discrepancy theory (Higgins, 1987). He proposed that people hold disagreeing internal representations of themselves that lead to different emotional states.
19.0K